All of this serves to degrade the natural clarity, balanced frequency response, stereo imaging, and surround localization cues possible from your sound system. Sound that continues to bounce around within the space will be perceived as reverberance.
Even though the reflection is only delayed a fraction of a second, it can cause comb filtering ( wiki), or a sense of echo. These sound wave reflections arrive late in time to the listener, after the direct sound from the loudspeaker, distorting and coloring the audio quality. The acoustic energy reflects off of hard/smooth architectural surfaces like drywall, plaster, masonry, hardwood floors, windows, etc. The style of loudspeaker commonly used in home theater has very low directionality, the bass and mid-range energy disperses in all directions. It is a common mistake to visualize sound as projecting like a laser in the direction the source points. Above a certain range, low-mid to high frequency response is characterized by specular (mirror-like) sound reflections. Low frequency (bass) response is characterized by unique modal resonances ( wiki) determined by the size and proportion of the rooms length, width, and height. Sound behaves much differently in a small room. Once you have carefully placed your 5.1 surround sound loudspeakers, video display, and prime listening position seating (see my article here for tips), you are ready to consider acoustic treatment for your home cinema.Īcoustically, a home theater is considered a small room (as compared to large auditoriums, concert halls, and churches). Locate specular reflection points with a mirror and a friend
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